Clues for the word "ACID"

We've had 484 crossword clues used for this word, and seen it 1349 times in crosswords. It was last seen in Mirror Mini crossword on August 23, 2026.

Definition of acid

a. - Sour, sharp, or biting to the taste; tart; having the taste of vinegar: as, acid fruits or liquors. Also fig.: Sour-tempered.
a. - Of or pertaining to an acid; as, acid reaction.
n. - A sour substance.
n. - One of a class of compounds, generally but not always distinguished by their sour taste, solubility in water, and reddening of vegetable blue or violet colors. They are also characterized by the power of destroying the distinctive properties of alkalies or bases, combining with them to form salts, at the same time losing their own peculiar properties. They all contain hydrogen, united with a more negative element or radical, either alone, or more generally with oxygen, and take their names from this negative element or radical. Those which contain no oxygen are sometimes called hydracids in distinction from the others which are called oxygen acids or oxacids.